If a pronominal reflexive is used in the nth person, then it is used in the (n+1)st person.
Standardized
IF there is a pronominal reflexive for 1st person, THEN there is also one for 2nd person. IF there is a pronominal reflexive for 2nd person, THEN there is also one for 3rd person.
1. See also Haiman & Munro 1983: xi , here #611.2. Cf. ##610, 1192, 1193.